paul ciancia killed one tsa officer and wounded four others. >> toronto mayor acknowledges he needs to make changes in his life. the police obtained a video that allegedly shows him smoking crack. >> a record number of runners race in the new york city marathon today. more than 50,000 strong. a kenyan runner who set a course record. geoffry mutai retained the title. some of america's best-kept secrets are out. by now, most of the world has heard the name edward snowden. the former national security agency contractor who released thousands of classified documents about government surveillance in one of the most significant leaks in u.s. history. he's been charged with espionage and has been living in russia under temporary asylum. the american journalist at the center of the story lives in brazil. >> we've had to come to rio to speak to glenn greenwald. he hasn't returned to the united states since he broke the story about the nsa surveillance programs for fear of being prosecuted. >> the nsa's goal really is the elimination of privacy globally. it is literally a system designed to moni